<g:form action="save" method="post" enctype="multipart/form-data">
    <input type="file" id="projectLogoPath" name="projectLogoPath" value="${fieldValue(bean:projectInstance,field:'projectLogoPath')}"/>
    <div class="avatarUpdate btn btn-primary"><g:message code="ljoj.onlinejudge.profile.avatar.update" default="update avatar" /></div>
</g:form>